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As noted, your top and bottom plates are very skinny. Post diameter is a little under cooked also.
I used 15mm for the plates and it feels nice and solid.
instead of going with a steel post, I went with 250mm water pipe(mains water wall thickness is about 12mm)
Filled with concrete and rebar. j bolts hold the top on, m10 adjusting bolts
base is a cube about 18 inches on to bedrock.
making a steel post is cool, but imho they ring like a bell.
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